TM 1-1520-238-T-4 Change 5 6–82.1 6–17. HOD XMN 2 READING – DISPLAYS 0 LB OIL PRESSURE 6–17 Tools: Nomenclature Part Number Tool Kit, Electrical SC518099CLA06 Repairer’s Multimeter, Digital AN/PSM-45 Personnel Required: 68X Armament/Electrical Systems Repairer References: TM 1-1520-238-23 TM 55-1500-323-24 TM 9-1230-476-20-2 Equipment Conditions: Ref Condition TM 1-1520-238-23 Access provisions – R60 fairing open WARNING Turn off power before detaching or attaching wires and connectors. High current 28 VDC or 115 VAC is present. Failure to do so could result in death or serious injury. NOTE If OIL PSI MAIN XMSN 2 indicator is also illuminated, troubleshoot Task 6–17.3 before proceeding. 1. Detach P578. Check for open between: P578–1 and P578–2, P578–1 and P578–3. Does open exist? YES Go to step 3. NO Go to step 2. 2. Check for short between: J578–1 and ground, J578–2 and ground, J578–3 and ground. Does short exist? YES Go to step 3. NO Go to step 4. 3. Locate open or short in wire harness between P578 and MT10. Can wire harness be repaired? YES Repair wiring (TM 55-1500-323-24). Go to paragraph 6–13. NO Replace MT10. Go to paragraph 6–13. 4. Reconnect P578. Detach P672. Check for open between: P672–95 and P672–94, P672–95 and P672–98, P672–95 and P672–109. Does open exist? YES Repair open wire between: P672–95 and J578–1, P672–94 and J578–3, P672–98 and J578–3, P672–109 and J578–2. Go to paragraph 6–13. NO Go to step 5. 5. Detach P578. Check for short between: P672–95 and ground, P672–94 and ground, P672–98 and ground, P672–109 and ground. Does short exist? YES Repair shorted wire between: P672–95 and J578–1, P672–94 and J578–3, P672–98 and J578–3, P672–109 and J578–2. Go to paragraph 6–13. NO Refer to TM 9-1230-476-20-2 to troubleshoot multiplex subsystem. END OF TASK